A new energy vehicle battery swap station thermal management system and a control method thereof

Abstract

The present application relates to the technical field of new energy automobile battery swap station, and provides a new energy automobile battery swap station heat management system and a control method thereof, the new energy automobile battery swap station heat management system comprises: at least two battery pack heat exchanger assemblies, each battery pack heat exchanger assembly has a containing cavity for placing a battery pack and a heat exchange channel capable of heat exchanging with the battery pack placed in the containing cavity; and a heat exchange medium supply system capable of providing heat exchange medium with different temperatures to different heat exchange channels according to the temperatures of different battery packs to be charged. The new energy automobile battery swap station heat management system provided by the present application completely solves the problem that the heat management system can only provide the same inlet temperature in the current technical solution when the states of the battery packs entering the station are different, and truly realizes on-demand energy adjustment and on-demand energy distribution, which is beneficial to reducing the energy consumption of the battery swap station.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy vehicle battery swap station, and particularly relates to a new energy vehicle battery swap station thermal management system and a control method thereof. BACKGROUND

[0002] With the vigorous promotion of electric vehicles in China, two routes of greater energy density power battery technology and faster and more efficient battery swap technology have been formed in the environmental adaptability of electric vehicles. The most advanced battery swap technology currently uses a liquid cooling scheme. Compared with the traditional air cooling scheme, the liquid cooling scheme has high energy utilization rate and faster cooling and heating efficiency. Different vehicles have different states when entering the battery swap station, and the corresponding replaced batteries also have different temperatures. However, the existing liquid cooling scheme can only provide heat transfer medium with the same temperature for each battery pack in the actual use process of the battery swap station. The energy of the battery swap station cannot be adjusted and distributed as needed, which easily causes energy waste of the battery swap station. SUMMARY

[0003] Therefore, the technical problem to be solved by the present application is that the existing liquid cooling scheme can only provide heat transfer medium with the same temperature for each battery pack in the actual use process of the battery swap station. The energy of the battery swap station cannot be adjusted and distributed as needed, which easily causes energy waste of the battery swap station. Therefore, a new energy vehicle battery swap station thermal management system and a control method thereof are provided.

[0004] To solve the above technical problems, the technical scheme of the present application is as follows:

[0005] On one hand, the present application provides a new energy vehicle battery swap station thermal management system, comprising: at least two battery pack heat exchanger assemblies, each of the battery pack heat exchanger assemblies has a containing cavity for placing a battery pack and a heat exchange channel capable of exchanging heat with the battery pack placed in the containing cavity; a heat exchange medium supply system, each of the heat exchange channels is in communication with the heat exchange medium supply system, and the heat exchange medium supply system can provide heat exchange medium with different temperatures to different heat exchange channels according to the temperatures of different battery packs to be charged.

[0006] Further, the heat exchange medium supply system comprises a first liquid supply pipeline, a second liquid supply pipeline and a flow proportional control valve; the first liquid supply pipeline is in communication with the heat exchange channel and is adapted to provide first heat exchange medium with a first preset temperature; the second liquid supply pipeline is in communication with the heat exchange channel and is adapted to provide second heat exchange medium with a second preset temperature; the flow proportional control valve is arranged at the inlet of each heat exchange channel, and the flow proportional control valve is used to adjust the proportion of the first heat exchange medium and the second heat exchange medium entering the heat exchange channel.

[0007] Further, the flow proportional control valve is a three-way valve, one of the two inlets of the three-way valve is connected with the first liquid supply pipeline, the other inlet of the three-way valve is connected with the second liquid supply pipeline, and the outlet of the three-way valve is connected with the inlet of the heat exchange channel.

[0008] Further, the heat exchange medium supply system further comprises a temperature sensor, the temperature sensor is arranged in each of the accommodation cavities, and is used to detect the temperature of the battery pack placed in the accommodation cavity; the temperature sensor is in signal connection with the flow proportional control valve, and the flow proportional control valve adjusts the proportion of the first heat exchange medium and the second heat exchange medium entering the heat exchange channel according to the temperature information of the battery pack fed back by the temperature sensor.

[0009] Further, the heat exchange medium supply system further comprises a manual stop valve, and the outlet of each of the heat exchange channels is provided with the manual stop valve.

[0010] Further, the new energy vehicle battery swap station heat management system further comprises a heat pump system, and the first liquid supply pipeline and the second liquid supply pipeline are connected with the heat pump system; the heat pump system provides energy required for heating the first heat exchange medium and cooling the second heat exchange medium; or the heat pump system provides energy required for cooling the first heat exchange medium and heating the second heat exchange medium.

[0011] Further, the heat pump system comprises a compressor, a four-way valve, an air-cooled heat exchanger, a waste heat recovery device, a filter, an expansion valve and a plate heat exchanger; the outlet of the compressor is connected with the T port of the four-way valve, the E port of the four-way valve is connected with the outlet of the air-cooled heat exchanger, the inlet of the air-cooled heat exchanger is connected with the first outlet of the waste heat recovery device, the first inlet of the waste heat recovery device is connected with the outlet of the filter, the inlet of the filter is connected with the outlet of the expansion valve, the inlet of the expansion valve is connected with the first outlet of the plate heat exchanger, the first inlet of the plate heat exchanger is connected with the C port of the four-way valve, the S port of the four-way valve is connected with the backflow port of the compressor, the inlet of the compressor is connected with the backflow port of the compressor; the liquid inlet pipe section of the first liquid supply pipeline is connected with the second inlet of the waste heat recovery device and a first heat exchange medium source, and the liquid outlet pipe section of the first liquid supply pipeline is connected with the second outlet of the waste heat recovery device and the inlet of the heat exchange channel; the liquid inlet pipe section of the second liquid supply pipeline is connected with the second inlet of the plate heat exchanger and a second heat exchange medium source, and the liquid outlet pipe section of the second liquid supply pipeline is connected with the second outlet of the plate heat exchanger and the inlet of the heat exchange channel.

[0012] Further, the new energy vehicle battery swap station heat management system further comprises a fan arranged on one side of the air-cooled heat exchanger and used for adjusting the heat exchange speed between the air-cooled heat exchanger and air.

[0013] Further, the heat exchange medium supply system further comprises a liquid supplement tank, the liquid supplement tank comprising two liquid outlet branches; the liquid inlet pipe section of the first liquid supply pipeline is connected with the second inlet of the waste heat recovery device and one of the liquid outlet branches of the liquid supplement tank; the liquid inlet pipe section of the second liquid supply pipeline is connected with the second inlet of the plate heat exchanger and the other liquid outlet branch of the liquid supplement tank.

[0014] Further, the heat exchange medium supply system further comprises a variable frequency pump and a water pressure sensor; the variable frequency pump is arranged at the liquid outlet of the liquid supplement tank; and the water pressure sensor is arranged at the liquid return port of the liquid supplement tank.

[0015] Further, the liquid supplement tank is provided with a liquid supplement valve at the liquid supplement port and a liquid discharge valve at the liquid discharge port; and the liquid supplement tank is further provided with a low liquid level switch, a medium liquid level switch and a high liquid level switch.

[0016] Further, the first heat exchange medium is refrigerant, and the second heat exchange medium is heat medium; or the first heat exchange medium is heat medium, and the second heat exchange medium is refrigerant.

[0017] In another aspect, the application further provides a control method of the new energy vehicle battery swap station heat management system, comprising the new energy vehicle battery swap station heat management system according to any one of the above aspects, and further comprising the following steps: in the temperature rising mode, the first heat exchange medium is refrigerant, and the second heat exchange medium is heat medium; when Td

[0018] Further, in the temperature falling mode, the first heat exchange medium is heat medium, and the second heat exchange medium is refrigerant; when Td>T3, the second heat exchange medium is used to rapidly reduce the temperature of the battery pack, and the compressor is operated at a high frequency; when T2

[0019] Further, the energy supplied by the waste heat recovery device to the first liquid supply pipeline is controlled by adjusting the rotating speed of the fan.

[0020] Further, if the fan speed is increased, the heat exchanged between the air-cooled heat exchanger and air is increased, and the energy obtained in the waste heat recovery device is reduced; if the fan speed is reduced, the heat exchanged between the air-cooled heat exchanger and air is reduced, and the energy obtained in the waste heat recovery device is increased.

[0021] The technical scheme of the present application has the following advantages:

[0022] The heat exchange medium supply system can provide heat exchange media with different temperatures to different heat exchange channels according to the temperatures of different battery packs to be charged, thereby providing different inlet temperatures to different battery packs in the battery swap station as needed, completely solving the problem that the battery swap station cannot provide the same inlet temperature for battery packs in different states in the prior art, and truly achieving energy adjustment and distribution as needed, which is beneficial to reducing the energy consumption of the battery swap station; in addition, the battery packs can be maintained at appropriate temperatures for charging, so that irreversible damage of the battery packs can be avoided, thereby prolonging the service life of the battery packs. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the specific embodiments or prior art of the present application, the drawings needed in the specific embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0024] Figure 1 FIG. 1 is a schematic diagram of a new energy vehicle battery swap station heat management system in an embodiment of the present application.

[0025] 1, compressor; 2, four-way valve; 3, air-cooled heat exchanger; 4, fan; 5, waste heat recovery device; 6, filter; 7, expansion valve; 8, plate heat exchanger; 9, variable frequency pump; 10, low liquid level switch; 11, medium liquid level switch; 12, high liquid level switch; 13, liquid supplement tank; 14, liquid supplement valve; 15, water pressure sensor; 16, liquid discharge valve; 17, three-way valve; 18, temperature sensor; 19, battery pack heat exchanger assembly; 20, manual stop valve; 21, first liquid supply pipeline; 22, second liquid supply pipeline. DETAILED DESCRIPTION

[0026] The technical scheme of the present application will be described in detail below with reference to the drawings. Obviously, the described embodiments are some embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0027] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] In addition, the technical features involved in the different embodiments of the application described below can be combined with each other as long as they do not conflict with each other.

[0030] As Figure 1 shown, the present embodiment provides a new energy vehicle battery swap station heat management system, comprising: at least two battery pack heat exchanger assemblies 19, each of the battery pack heat exchanger assemblies 19 has a containing cavity for placing a battery pack and a heat exchange channel capable of heat exchange with the battery pack placed in the containing cavity.

[0031] A heat exchange medium supply system, each of the heat exchange channels is in communication with the heat exchange medium supply system, and the heat exchange medium supply system can provide heat exchange media with different temperatures to different heat exchange channels according to the temperatures of different battery packs to be charged.

[0032] For example, the heat exchange medium supply system comprises a first liquid supply pipeline 21, a second liquid supply pipeline 22 and a flow proportional control valve; the first liquid supply pipeline 21 is in communication with the heat exchange channel and is adapted to provide first heat exchange medium with a first preset temperature; the second liquid supply pipeline 22 is in communication with the heat exchange channel and is adapted to provide second heat exchange medium with a second preset temperature; the flow proportional control valve is arranged at the inlet of each heat exchange channel, and the flow proportional control valve is used to adjust the proportion of the first heat exchange medium and the second heat exchange medium entering the heat exchange channel.

[0033] Preferably, the flow ratio control valve is a three-way valve 17, which includes two inlets and one outlet, one of the inlets of the three-way valve 17 is connected with the first liquid supply pipeline 21, the other inlet of the three-way valve 17 is connected with the second liquid supply pipeline 22, and the outlet of the three-way valve 17 is connected with the inlet of the heat exchange channel. For example, the three-way valve 17 can adjust the flow ratio of the first heat exchange medium and the second heat exchange medium by pulse, and keep the flow changes of the two opposite when adjusting.

[0034] For example, the heat exchange medium supply system further includes a temperature sensor 18, which is arranged in each of the accommodation cavities to detect the temperature of the battery pack placed in the accommodation cavity, and the temperature sensor 18 is signal connected with the flow ratio control valve, and the flow ratio control valve adjusts the ratio of the first heat exchange medium and the second heat exchange medium entering the heat exchange channel according to the temperature information of the battery pack fed back by the temperature sensor 18. In this way, the flow ratio control valve can dynamically adjust the flow ratio according to the real-time temperature of the battery pack. For example, when the battery pack is in heating mode, the temperature difference between the battery pack before heating and the target temperature is large, and at this time, the heat exchange medium with high temperature can be used for heating to realize rapid heating, and when the temperature of the battery pack approaches the target temperature, the heat exchange medium with relatively low temperature is used for heating to make the heating process relatively gentle and slow, which is beneficial to improve the temperature control and energy saving effect. Similarly, when the battery pack is in cooling mode, the temperature difference between the battery pack before cooling and the target temperature is large, and at this time, the heat exchange medium with low temperature can be used for cooling to realize rapid cooling, and when the temperature of the battery pack approaches the target temperature, the heat exchange medium with relatively low temperature is used for cooling to make the cooling process relatively gentle and slow, which is beneficial to improve the temperature control and energy saving effect.

[0035] For example, the new energy vehicle battery swap station heat management system further includes a manual stop valve 20, which is arranged on each pipeline connected with the outlet of the heat exchange channel. For example, when the three-way valve 17 is closed, the flow of the first liquid supply pipeline 21 and the second liquid supply pipeline 22 can be closed at the same time, and when the three-way valve 17 and the manual stop valve 20 are closed, the battery pack heat exchanger assembly 19 can be replaced without emptying the heat exchange medium in the system.

[0036] The specific values of the first preset temperature and the second preset temperature are not limited, and the purpose is to make the first heat exchange medium and the second heat exchange medium have different temperature gradients. In general, when the first heat exchange medium is a coolant lower than the target temperature required for charging the battery pack, the second heat exchange medium is a heat medium higher than the target temperature required for charging the battery pack, or when the first heat exchange medium is a heat medium higher than the target temperature required for charging the battery pack, the second heat exchange medium is a coolant lower than the target temperature required for charging the battery pack. In this way, when the proportion of the first heat exchange medium and the second heat exchange medium is adjusted, the temperature of the mixed heat exchange medium can be maintained at the target temperature required by the battery pack.

[0037] For example, a plurality of battery pack heat exchanger assemblies 19 can be arranged in parallel, each battery pack heat exchanger assembly 19 is provided with a flow ratio control valve, and the temperature of the heat exchange medium for heating or cooling is adjusted separately and is not affected by each other.

[0038] The new energy vehicle battery swap station thermal management system provided in the embodiment can provide heat exchange media with different temperatures to different heat exchange channels according to the temperatures of different battery packs to be charged, thereby providing different inlet temperatures to each different battery pack in the battery swap station as needed, completely solving the problem that the battery swap station can only provide the same inlet temperature for different battery packs in the current technical solution, and truly achieving energy adjustment and distribution as needed, which is beneficial to reduce the energy consumption of the battery swap station. Moreover, by adjusting the temperature of the heat exchange medium, the battery pack can be maintained at a suitable temperature for charging, so as to avoid irreversible damage to the battery pack, thereby prolonging the service life of the battery pack.

[0039] The new energy vehicle battery swap station thermal management system further includes a heat pump system, and the first liquid supply pipeline 21 and the second liquid supply pipeline 22 are connected to the heat pump system. The heat pump system provides the energy required for heating the first heat exchange medium and cooling the second heat exchange medium, or the heat pump system provides the energy required for cooling the first heat exchange medium and heating the second heat exchange medium.

[0040] Specifically, the heat pump system comprises a compressor 1, a four-way valve 2, an air-cooled heat exchanger 3, a waste heat recovery device 5, a filter 6, an expansion valve 7, and a plate heat exchanger 8. The outlet of the compressor 1 is connected to the T port of the four-way valve 2, the E port of the four-way valve 2 is connected to the outlet of the air-cooled heat exchanger 3, the inlet of the air-cooled heat exchanger 3 is connected to the first outlet of the waste heat recovery device 5, the outlet of the filter 6 is connected to the first inlet of the waste heat recovery device 5, the inlet of the filter 6 is connected to the outlet of the expansion valve 7, the inlet of the expansion valve 7 is connected to the first outlet of the plate heat exchanger 8, the first inlet of the plate heat exchanger 8 is connected to the C port of the four-way valve 2, the S port of the four-way valve 2 is connected to the backflow port of the compressor 1, and the inlet of the compressor 1 is connected to the backflow port of the compressor. The liquid inlet pipe section of the first liquid supply pipe 21 is connected to the second inlet of the waste heat recovery device 5 and the first heat exchange medium source, and the liquid outlet pipe section of the first liquid supply pipe 21 is connected to the second outlet of the waste heat recovery device 5 and the inlet of the heat exchange channel. The liquid inlet pipe section of the second liquid supply pipe 22 is connected to the second inlet of the plate heat exchanger 8 and the second heat exchange medium source, and the liquid outlet pipe section of the second liquid supply pipe 22 is connected to the second outlet of the plate heat exchanger 8 and the inlet of the heat exchange channel. It should be noted that the above-mentioned components can be connected through necessary pipelines when connected. In this way, the entire heat pump system can recover and utilize the energy of the system through the waste heat recovery device 5, without the need for additional heat sources.

[0041] The new energy automobile battery swap station heat management system further comprises a fan 4 arranged on one side of the air-cooled heat exchanger 3 and used for adjusting the heat exchange speed between the air-cooled heat exchanger 3 and air. For example, the fan 4 can be a variable frequency fan. When the rotating speed of the fan 4 increases, the heat exchange speed between the air-cooled heat exchanger 3 and air can be accelerated, and when the rotating speed of the fan 4 decreases, the heat exchange speed between the air-cooled heat exchanger 3 and air can be reduced.

[0042] The new energy automobile battery swap station heat management system further comprises a liquid supplement tank, and the liquid supplement tank comprises two liquid outlet branches. The liquid inlet pipe section of the first liquid supply pipe is connected to the second inlet of the waste heat recovery device and one of the liquid outlet branches of the liquid supplement tank, and the liquid inlet pipe section of the second liquid supply pipe is connected to the second inlet of the plate heat exchanger and the other liquid outlet branch of the liquid supplement tank. For example, the heat exchange medium in the liquid supplement tank can be a glycol solution.

[0043] The new energy vehicle battery swap station heat management system further comprises a variable frequency pump 9 and a water pressure sensor 15; the variable frequency pump 9 is arranged at the liquid outlet of the liquid supplement tank 13; and the water pressure sensor 15 is arranged at the liquid return port of the liquid supplement tank 13. During use, the variable frequency pump 9 automatically adjusts the power according to the number of open three-way valves 17; when the number of open three-way valves 17 increases, the variable frequency pump 9 increases in speed and flow; and when the number of open three-way valves 17 decreases, the variable frequency pump 9 decreases in speed and flow. In this way, the flow demand of the liquid circuit can be met, and the damage of the battery pack heat exchanger assembly 19 caused by excessive flow when the number of open battery packs is small can be prevented.

[0044] The liquid supplement port of the liquid supplement tank 13 is provided with a liquid supplement valve 14; the liquid discharge port of the liquid supplement tank 13 is provided with a liquid discharge valve 16, which can be opened to discharge the liquid supplement tank 13; and the liquid supplement tank 13 is further provided with a low liquid level switch 10, a medium liquid level switch 11 and a high liquid level switch 12. For the liquid supplement tank 13, during use, when the water level is lower than the low liquid level switch 10, the liquid supplement valve 14 is opened to automatically supplement the liquid in the liquid supplement tank 13 until the water level reaches the position of the high liquid level switch 12, and the liquid supplement is stopped. When the low liquid level switch 10 fails, the medium liquid level switch 11 replaces the low pressure switch to perform the above-mentioned action. The heat exchange medium in the liquid supplement tank 13 is divided into two branches after passing through the variable frequency pump, one part of the heat exchange medium passes through the plate heat exchanger to absorb cold energy to achieve cooling or absorb heat to achieve heating, and the other part of the heat exchange medium passes through the waste heat recovery device to absorb waste heat to achieve cooling or absorb waste heat to achieve heating. The temperature changes of the two parts of heat exchange medium are opposite, and the high-temperature and low-temperature heat exchange medium is mixed at the three-way valve 17 to provide different inlet temperatures for different battery packs. The outlets of all heat exchange channels can be merged and then flow into the liquid supplement tank 13 through the liquid return port of the liquid supplement tank 13 to recycle the heat exchange medium.

[0045] The heat pump system in the present application has two different modes when supplying energy to the heat exchange medium supply system, and can flexibly adopt a more energy-saving working mode according to the external room temperature and the condition of the battery pack.

[0046] For example, when the external room temperature is low and the battery pack usually needs to be heated, at this time:

[0047] The compressor 1 compresses the low-temperature and low-pressure gaseous refrigerant into high-temperature and high-pressure gaseous refrigerant, which enters the T port of the four-way valve 2 and flows to the C port of the four-way valve 2 to the plate heat exchanger 8, is condensed into medium-temperature and high-pressure liquid refrigerant in the plate heat exchanger 8, and transfers the condensation heat to the second heat exchange medium, thereby heating the second heat exchange medium. The medium-temperature and high-pressure liquid refrigerant is throttled into low-temperature and low-pressure liquid refrigerant by the expansion valve 7, is filtered by the filter 6, is evaporated into low-temperature refrigerant in a gas-liquid mixed state in the waste heat recovery device 5, absorbs the heat of the first heat exchange medium to cool the first heat exchange medium, enters the air-cooled heat exchanger 3, is completely evaporated into low-temperature gaseous refrigerant by heat exchange with air, and enters the S port of the four-way valve 2 from the E port of the four-way valve 2 to flow to the compressor 1, thereby realizing a complete refrigeration cycle.

[0048] The second heat exchange medium and the first heat exchange medium are transported by the variable frequency pump, are mixed by adjusting the proportion of the two at the three-way valve 17, enter the battery pack heat exchanger assembly 19 at the most suitable temperature, exchange heat to the battery pack in the battery pack heat exchanger assembly, and realize the purpose of heating the power battery.

[0049] For example, when the external room temperature is high, the battery pack usually needs to be cooled, at this time:

[0050] The compressor 1 compresses the low-temperature and low-pressure gaseous refrigerant into high-temperature and high-pressure gaseous refrigerant, which enters the T port of the four-way valve 2 and flows to the E port of the four-way valve 2 to the air-cooled heat exchanger 3, is condensed into medium-temperature and high-pressure gaseous-liquid mixed refrigerant in the air-cooled heat exchanger 3 by heat exchange with air, is further condensed into medium-temperature and high-pressure liquid refrigerant in the waste heat recovery device 5, and transfers the condensation heat to the first heat exchange medium to heat the first heat exchange medium.

[0051] The first heat exchange medium is heated and warmed up, the medium-temperature and high-pressure liquid refrigerant is filtered by the filter 6, is throttled into low-temperature and low-pressure liquid refrigerant by the expansion valve 7, is evaporated into low-temperature and low-pressure gaseous refrigerant in the plate heat exchanger 8, absorbs the heat of the second heat exchange medium to cool the second heat exchange medium, the low-temperature and low-pressure gaseous refrigerant enters the S port of the four-way valve 2 from the C port of the four-way valve 2 to flow to the compressor 1, thereby realizing a complete refrigeration cycle.

[0052] The second heat exchange medium and the first heat exchange medium are transported by the variable frequency pump 9, are mixed by adjusting the proportion of the two at the three-way valve 17, enter the battery pack heat exchanger assembly 19 at the most suitable temperature, exchange heat to the battery pack in the battery pack heat exchanger assembly 19, and realize the purpose of cooling the power battery.

[0053] Another embodiment also provides a control method of the new energy vehicle battery swap station thermal management system, comprising the new energy vehicle battery swap station thermal management system of any one of the above, and further comprising the following steps: in the heating mode, the first heat exchange medium is the refrigerant, and the second heat exchange medium is the heat medium; when Td

[0054] In the cooling mode, the first heat exchange medium is the heat medium, and the second heat exchange medium is the refrigerant; when Td > T3, the battery pack is rapidly cooled through the second heat exchange medium, and the compressor 1 is operated at an increasing frequency; when T2 < Td < T3, the battery pack is slowly cooled through the mixed heat exchange medium formed by the first heat exchange medium and the second heat exchange medium, and the compressor 1 is operated at a decreasing frequency, so that Td = T2 finally; wherein T3 is the high point value of the evaluation temperature.

[0055] In the cooling mode, the first heat exchange medium is the heat medium, and the second heat exchange medium is the refrigerant; when Td > T3, the battery pack is rapidly cooled through the second heat exchange medium, and the compressor 1 is operated at an increasing frequency; when T2 < Td < T3, the battery pack is slowly cooled through the mixed heat exchange medium formed by the first heat exchange medium and the second heat exchange medium, and the compressor 1 is operated at a decreasing frequency, so that Td = T2 finally; wherein T3 is the high point value of the evaluation temperature.

[0056] In the cooling mode, the first heat exchange medium is the heat medium, and the second heat exchange medium is the refrigerant; when Td > T3, the battery pack is rapidly cooled through the second heat exchange medium, and the compressor 1 is operated at an increasing frequency; when T2 < Td < T3, the battery pack is slowly cooled through the mixed heat exchange medium formed by the first heat exchange medium and the second heat exchange medium, and the compressor 1 is operated at a decreasing frequency, so that Td = T2 finally; wherein T3 is the high point value of the evaluation temperature.

[0057] In summary, the new energy vehicle battery swap station thermal management system in the present application transfers heat or cold through the heat exchange medium to the battery pack in the battery swap station through the heat pump system, so that the battery pack always works in the most suitable temperature range, so as to obtain higher charging efficiency and safer charging process. Moreover, the refrigeration and heating in the present application both adopt the heat pump system, which is more green and energy-saving than the single cooling + electric heating heating technical solution currently adopted in the industry. Most importantly, the waste heat recovery scheme adopted in the present application can provide different inlet temperatures for different battery packs in the battery swap station as needed, completely solving the defect that the battery states are different but the thermal management system can only provide the same inlet temperature in the current technical solution, and truly achieving energy adjustment and distribution as needed, greatly prolonging the service life of the battery and saving the energy consumption of the battery swap station.

[0058] Obviously, the above embodiments are merely example for clearly illustrating but not limitation to the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments need not and can not be enumerated. The obvious changes or variations derived from the above description are still within the protection scope of the present application.

Claims

1. A thermal management system for a new energy vehicle battery swapping station, characterized in that, include: At least two battery pack heat exchanger assemblies, each of the battery pack heat exchanger assemblies having a receiving cavity for placing the battery pack and a heat exchange channel capable of exchanging heat with the battery pack placed in the receiving cavity; A heat exchange medium supply system is provided, wherein each heat exchange channel is connected to the heat exchange medium supply system, and the heat exchange medium supply system can provide heat exchange medium with different temperatures to different heat exchange channels according to the temperature of different battery packs to be charged. The heat exchange medium supply system includes a first liquid supply pipeline, a second liquid supply pipeline, and a flow proportional control valve; The first liquid supply pipeline is connected to the heat exchange channel and is suitable for providing a first heat exchange medium at a first preset temperature. The second liquid supply pipeline is connected to the heat exchange channel and is suitable for providing a second heat exchange medium at a second preset temperature; Each heat exchange channel is equipped with a flow ratio control valve at its inlet. The flow ratio control valve is used to adjust the ratio of the first heat exchange medium to the second heat exchange medium entering the heat exchange channel. It also includes a heat pump system, and both the first liquid supply line and the second liquid supply line are connected to the heat pump system; The heat pump system provides the energy required to heat the first heat exchange medium and cool the second heat exchange medium. Alternatively, the heat pump system may provide the energy required to cool the first heat exchange medium and heat the second heat exchange medium; The heat pump system includes a compressor, a four-way valve, an air-cooled heat exchanger, a waste heat recovery unit, a filter, an expansion valve, and a plate heat exchanger. The compressor outlet is connected to the T port of the four-way valve, the four-way valve E port is connected to the outlet of the air-cooled heat exchanger, the air-cooled heat exchanger inlet is connected to the first outlet of the waste heat recovery unit, the waste heat recovery unit first inlet is connected to the outlet of the filter, the filter inlet is connected to the outlet of the expansion valve, the expansion valve inlet is connected to the first outlet of the plate heat exchanger, the plate heat exchanger first inlet is connected to the C port of the four-way valve, the four-way valve S port is connected to the compressor return port, and the compressor inlet is connected to the compressor return port. The inlet section of the first liquid supply pipeline is connected to the second inlet of the waste heat recovery unit and the first heat exchange medium source, and the outlet section of the first liquid supply pipeline is connected to the second outlet of the waste heat recovery unit and the inlet of the heat exchange channel. The inlet section of the second liquid supply pipeline connects the second inlet of the plate heat exchanger to the second heat exchange medium source, and the outlet section of the second liquid supply pipeline connects the second outlet of the plate heat exchanger to the inlet of the heat exchange channel.

2. The thermal management system for new energy vehicle battery swapping stations according to claim 1, characterized in that, The flow proportional control valve is a three-way valve, which includes two inlets and one outlet. One inlet of the three-way valve is connected to the first liquid supply pipeline, the other inlet of the three-way valve is connected to the second liquid supply pipeline, and the outlet of the three-way valve is connected to the inlet of the heat exchange channel.

3. The thermal management system for new energy vehicle battery swapping stations according to claim 1, characterized in that, The heat exchange medium supply system also includes a temperature sensor; Each of the aforementioned accommodating cavities is equipped with a temperature sensor for detecting the temperature of the battery pack placed within the accommodating cavity; The temperature sensor is connected to the flow proportional control valve, and the flow proportional control valve adjusts the ratio of the first heat exchange medium to the second heat exchange medium entering the heat exchange channel according to the temperature information of the battery pack fed back by the temperature sensor.

4. The thermal management system for new energy vehicle battery swapping stations according to claim 1, characterized in that, The heat exchange medium supply system also includes a manual shut-off valve, and each heat exchange channel outlet is equipped with the manual shut-off valve.

5. The thermal management system for new energy vehicle battery swapping stations according to claim 1, characterized in that, It also includes a fan, which is located on one side of the air-cooled heat exchanger and is used to adjust the heat exchange rate between the air-cooled heat exchanger and the air.

6. The thermal management system for new energy vehicle battery swapping stations according to claim 1, characterized in that, The heat exchange medium supply system also includes a makeup water tank, which has two liquid outlet branches. The inlet section of the first liquid supply pipeline is connected to the second inlet of the waste heat recovery unit and one of the outlet branches of the replenishment water tank; The inlet section of the second liquid supply pipeline connects the second inlet of the plate heat exchanger to another outlet branch of the replenishment water tank.

7. The thermal management system for new energy vehicle battery swapping stations according to claim 6, characterized in that, The heat exchange medium supply system also includes a variable frequency pump and a water pressure sensor; The variable frequency pump is installed at the outlet of the replenishment water tank; The water pressure sensor is installed at the return port of the replenishment water tank.

8. The thermal management system for a new energy vehicle battery swapping station according to claim 6, characterized in that, The replenishment tank is equipped with a replenishment valve at its replenishment port; The drain outlet of the replenishment tank is equipped with a drain valve; The replenishment tank is also equipped with a low level switch, a medium level switch, and a high level switch.

9. The thermal management system for new energy vehicle battery swapping stations according to claim 1, characterized in that, The first heat exchange medium is a refrigerant, and the second heat exchange medium is a heat exchange medium; Alternatively, the first heat exchange medium may be a heat exchange medium, and the second heat exchange medium may be a cold exchange medium.

10. A control method for a thermal management system of a new energy vehicle battery swapping station, characterized in that, The new energy vehicle battery swapping station thermal management system according to any one of claims 1 to 9 further includes the following steps: In heating mode, the first heat exchange medium is a refrigerant, and the second heat exchange medium is a heat exchange medium. When Td < T1, the battery pack is rapidly heated through the second heat exchange medium, and the compressor is operated at a higher frequency. When T1 < Td < T2, the battery pack is slowly heated by the mixed heat exchange medium formed by the first heat exchange medium and the second heat exchange medium, and the compressor is operated at a reduced frequency, so that Td = T2. Where Td is the temperature value of the battery pack, T1 is the low point value of the evaluation temperature, and T2 is the target temperature value for charging the battery pack.

11. The control method for the thermal management system of a new energy vehicle battery swapping station according to claim 10, characterized in that, In cooling mode, the first heat exchange medium is a heat transfer medium, and the second heat exchange medium is a refrigerant. When Td > T3, the battery pack is rapidly cooled through the second heat exchange medium, and the compressor is operated at a higher frequency. When T2 < Td < T3, the battery pack is slowly cooled by the mixed heat exchange medium formed by the first heat exchange medium and the second heat exchange medium, and the compressor is operated at a reduced frequency, so that Td = T2. Among them, T3 is the highest value for evaluating temperature.

12. The control method for the thermal management system of a new energy vehicle battery swapping station according to claim 11, characterized in that, The energy supplied to the first liquid supply pipeline by the waste heat recovery unit is controlled by adjusting the speed of the fan.

13. The control method for the thermal management system of a new energy vehicle battery swapping station according to claim 12, characterized in that, If the fan speed increases, the amount of heat exchanged between the air-cooled heat exchanger and the air increases, and the energy obtained in the waste heat recovery unit decreases. If the fan speed decreases, the amount of heat exchanged between the air-cooled heat exchanger and the air decreases, and the energy obtained in the waste heat recovery unit increases.

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